Senior Reverse Engineer

This is a fully remote position, open to applicants in Croatia.

📋 Description

• Reverse-engineer advanced antibot and fingerprinting systems found on the web, including JavaScript virtual machines, WebAssembly, and various forms of obfuscated or polymorphic code.

• Develop JS function tracing, deobfuscation pipelines, and fingerprint-inspection tools that transform manual reverse-engineering efforts into efficient, repeatable, and largely automated processes.

• Leverage AI technologies extensively — including large language models, agents, and tailored automation — to deobfuscate, categorize, and assess detection surfaces, while swiftly prototyping and delivering tools that would typically require weeks to create.

• Establish and sustain website intelligence pipelines with a recorded history, ensuring that when an antibot updates, we can compare against a known-good baseline rather than starting the problem-solving process anew.

• Provide our AI systems for reverse-engineering and ban resolution with the necessary context, signals, and structured intelligence to autonomously manage the majority of cases.

• Transform one-off reverse-engineering successes into lasting capabilities — including tools, rules, and pipelines that can be utilized by fellow engineers and AI agents alike.

• Collaborate across engineering teams to integrate your tools into the custom browser and automation stack, while also mentoring others in AI-enhanced reverse-engineering techniques.

⛳️ Requirements

• A hacker mentality — capable of swiftly creating proof-of-concepts and functional tools to achieve results, and at ease with the inherent uncertainty and open-ended nature of the work.

• Proven experience utilizing AI tools (such as large language models, coding agents, and automation) to enhance your engineering efforts, with a keen sense of what tasks to automate and when.

• Strong expertise in JavaScript/Node.js and Python, complemented by a broad programming background and outstanding problem-solving skills.

• Excellent research, debugging, fuzzing, and reverse-engineering capabilities, encompassing static, dynamic, and concolic analysis.

• Practical experience in reversing JavaScript VMs, WebAssembly, and heavily obfuscated or polymorphic code.

• A comprehensive understanding of operating systems and computer networking principles.

• Proficient with tools like Wireshark, Burp Suite, and similar applications for intercepting and troubleshooting network traffic.

• Knowledgeable about browser engines, browser fingerprinting, and antibot/anti-scraping strategies.

• Ability to prioritize tasks logically and based on a measurement-driven strategy, thriving in a collaborative setting.

• Bonus points for:

• Experience with reverse-engineering tools such as IDA, Ghidra, Frida, or Babel.

• Background in building tools or pipelines that support machine learning or AI systems.

• Familiarity with C/C++ and Rust.

• Significant contributions to Mozilla or Chromium projects.

🏝️ Benefits

• Join a self-driven, forward-thinking, and multicultural team.

• Enjoy the freedom and flexibility to work from your preferred environment.

• Participate in conferences and connect with team members from around the world.

• Work with state-of-the-art open-source technologies and tools.